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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a1db728b01e997a64ab65fbf0d7f9e84916c1f8b5fc125d7a8e5448f7dc24e' 
  AND token = 'quZCaylZGSSXbjRlNQ4qZpGDYHjIarlCn+YiWqQjnWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}